Mary used
110 of the ribbon to tie some presents. She threw away
611 of the remaining ribbon. As a result, she had 135 cm of the ribbon left. How much ribbon did Mary have at first? Give your answer in cm.
Fraction of the ribbon left after tying some presents
= 1 -
110=
910 Fraction of the remaining ribbon left after throwing away
= 1 -
611=
511
Fraction of the total ribbon left
=
910 ×
511=
922
Length of the ribbon at first = 22 u
Length of the ribbon left = 9 u
9 u = 135
1 u = 135 ÷ 9 = 15
Length of the ribbon at first
= 22 u
= 22 x 15
= 330 cm
Answer(s): 330 cm